@media screen and (max-width: 768px) {
  #header {
    height: 51px;
    background-color: #fff!important;
    position: fixed;
    top: 0;
    left: 0;
    line-height: 51px;
  }
  .nav-phone {
    display: block;
    width: 100%;
    background-color: #fff;
    z-index: 111;
  }
  .nav-phone ul li a {
    display: block;
    line-height: 40px;
    color: #666;
    padding-left: 15px;
  }
}
